MIL-PRF-49367C (CR)
3.5.9.1 Adjustment accuracy. Each click of either adjustment control
shall displace the reticle pattern 0.25 ± 0.04 milliradian.
3.5.9.2 Reticle excursion. The reticle adjustment controls shall move
the reticle a minimum of 2.5° in any direction from the optical axis.
3.5.9.3 Torque. The dynamic torque required to adjust the reticle
position shall be between 0.5 and 4.0 inch pounds.
3.5.9.4 Rotational alignment. The reticle shall not appear rotated
more than 1° from its proper orientation.
3.6
Environmental.
NOTE: Post-environmental verification of performance shall be Flange
focal distance (3.5.2), Veiling glare/stray light (3.5.4) and Modulation
transfer function (3.5.8). Failure to meet these requirements shall
constitute failure due to degradation of performance of input or output
characteristics per the damage technical interpretation of 3.10.1.
3.6.1 Temperature extremes. The objective shall not be damaged (see
3.10.1) after storage in any temperature from -51°C to +68°C. The objective
shall not be damaged (see 3.10.1) after being subjected to repetitive
temperature changes between +23°C and +68°C in a 5 minute period and between
+23°C and -51°C in a 5 minute period. The transition from +68°C to -51°C and
from -51°C to +68°C shall include a 2 hour soak at +23°C. Soak time at
temperature extremes shall be sufficient for the entire objective to attain
stabilization.
3.6.2 Vibration. The objective shall not be damaged (see 3.10.1) after
being subjected to simple harmonic motion having an amplitude of 0.015 inch,
(0.03 inch total excursion) with the frequency being varied between 5 and 55
hertz (Hz). The duration shall be five (5) minutes minimum in each of three
(3) mutually perpendicular planes of which one (1) is perpendicular to the
optical axis.
3.6.3 Altitude. The objective shall not be damaged (see 3.10.1) after
storage at a pressure equivalent to 10,000 feet altitude above sea level.
3.6.4 Humidity. The objective shall not be damaged (see 3.10.1) after
storage up to +68°C with 95, ±5 percent relative humidity.
3.6.5 Immersion. The objective shall not be damaged (see 3.10.1) after
being immersed in fresh water to a depth of not less than 3 feet for a period
of not less than 30 minutes. The objective shall be pre-conditioned by
exposure to a temperature of +45°C ±3°C for a period of 2 hours prior to being
immersed in the fresh water at a temperature of +18°C ±5°C.
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